With only the price and departure and return dates revealed, prospective cruisers will need solve a series of riddles to reveal details like destinations, stop-overs, and connecting flights.

Or, your could simply not bother and instead be pleasantly surprised by the itinerary when you board. Those who really want to know what they're in for can opt to have the full itinerary revealed to them after booking.

"We wanted to provoke people's interest in the destinations," Bolsover Cruise Club managing director Michael Wilson said in a statement.

"Travelling is not as adventurous as it once was…This is our attempt [at bringing] back some of the adventure, albeit with all the comforts of a luxury cruise."

He added that over-confident riddlers might be surprised to find they've missed the mark, and could be "perhaps even wrong by a few continents".

The 16-night cruise covers six or more destinations, and costs just under $20,000 (£12,339) per person.